Worksite power distribution box

ABSTRACT

A power distribution box apparatus and method for implementing a priority disconnect scheme and a network communication bridge at a worksite, where the power distribution box distributes temporary power. The power distribution box includes a housing portion and a base portion elevating the housing portion off of the ground or another surface. The power distribution box includes a communication module having a network connecting module operable to connect to an external communication network (e.g., the Internet), and a wireless network module operable to wirelessly communicate with an external device (e.g., a smart phone) to, thereby, connect the external device to the external communication network. The power distribution box may also include a priority disconnect module to selectively disconnect AC output receptacles in response to over-current situations based on a priority level associated with each receptacle.

CROSS-REFERENCE TO RELATED APPLICATIONS

The Application claims priority to U.S. Provisional Patent Application No. 61/767,868, filed Feb. 22, 2013, the entire contents of which are hereby incorporated by reference.

FIELD OF THE INVENTION

The invention relates to systems and methods for distributing power at a worksite.

BACKGROUND

Temporary power systems distribute power at worksites, such as construction projects, where permanent power is not available. For instance, in constructing a building, an on-site generator may generate power for use by construction workers for powering various tools and items, such as power drills, saws, radios, computers, lighting, etc. Alternatively, a temporary connection to a power utility grid may be used.

SUMMARY

In one embodiment, a power distribution box is provided that includes a housing portion and a base portion elevating the housing portion above a surface on which the power distribution box is placed. The power distribution box further includes a power source input operable to receive power from an external power source; a plurality of alternating current (AC) output receptacles electrically coupled to the power source input; and a communication module. The communication module includes a network connecting module operable to connect to an external communication network, and a wireless network module operable to wirelessly communicate with an external device and to, thereby, connect the external device to the external communication network.

In another embodiment, a communication bridge method for a power distribution box is provided, the power distribution box including a housing portion with a plurality of AC output receptacles, a base that elevates the housing portion, a communication module having a network connecting module, and a wireless network module. The method includes positioning the power distribution box at a worksite; receiving, at a power input of the power distribution box, alternating current (AC) power from an external power source; and distributing the AC power received from the external power source to the AC output receptacles. The method further includes connecting the network connecting module of the power distribution box to an external communication network; and wirelessly communicating with an external device via the wireless network module of the power distribution box to thereby connect the external device to the external communication network.

In another embodiment, a priority disconnect method for a power distribution box is provided. The method includes receiving, at a power input of the power distribution box, alternating current (AC) power from an external power source; setting a priority level for each of a plurality of AC output receptacles of the power distribution box; and distributing the AC power received from the external power source to the AC output receptacles. The method further includes detecting a sum current level for the plurality of AC output receptacles; and determining that the sum current level exceeds a priority disconnect threshold. In response to determining that the sum current level exceeds the priority disconnect threshold, the method includes selectively disconnecting a first AC output receptacle of the plurality of AC output receptacles from the power input based on the priority level of the first AC output receptacle.

Embodiments of the invention involve distribution of temporary power using priority disconnects and the incorporation of wireless communication systems in a power box distribution network. Other aspects of the invention will become apparent by consideration of the detailed description and accompanying drawings.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 illustrates a temporary power distribution system according to embodiments of the invention.

FIG. 2 illustrates a diagram of a power box having a priority disconnect module.

FIGS. 3A and 3B illustrate additional details of an outlet on a power box.

FIGS. 4A and 4B are power box current graphs.

FIG. 5 illustrates a method of implementing a priority disconnect on a power box.

FIG. 6 illustrates a temporary power distribution system including power boxes with network communication capabilities.

FIGS. 7-8 illustrate power boxes including network communication capabilities.

DETAILED DESCRIPTION

Before any embodiments of the invention are explained in detail, it is to be understood that the invention is not limited in its application to the details of construction and the arrangement of components set forth in the following description or illustrated in the following drawings. The invention is capable of other embodiments and of being practiced or of being carried out in various ways. Also, it is to be understood that the phraseology and terminology used herein is for the purpose of description and should not be regarded as limiting.

It should also be noted that a plurality of hardware and software based devices, as well as a plurality of different structural components may be used to implement the invention. In addition, it should be understood that embodiments of the invention may include hardware, software, and electronic components or modules that, for purposes of discussion, may be illustrated and described as if the majority of the components were implemented solely in hardware. However, one of ordinary skill in the art, and based on a reading of this detailed description, would recognize that, in at least one embodiment, the electronic based aspects of the invention may be implemented in software (e.g., stored on non-transitory computer-readable medium) executable by one or more processors. As such, it should be noted that a plurality of hardware and software based devices, as well as a plurality of different structural components may be utilized to implement the invention. Furthermore, and as described in subsequent paragraphs, the specific mechanical configurations illustrated in the drawings are intended to exemplify embodiments of the invention and that other alternative mechanical configurations are possible. For example, “controllers” described in the specification can include standard processing components, such as one or more processors, one or more computer-readable medium modules, one or more input/output interfaces, and various connections (e.g., a system bus) connecting the components.

FIG. 1 illustrates an exemplary temporary power distribution system 100. The system 100 includes a power source 102, such as one or both of a utility grid power source 102 a and a mobile generator power source 102 b. One of the utility grid power source 102 a and the mobile generator 102 b is generally operating, while the other is either not present in the system 100 or on standby. In some instances, the mobile generator 102 b acts as a backup power source in case of a power outage of the utility grid power source 102 a.

The utility grid power source 102 a is coupled to a local transformer substation 106 and provides a 50 Ampere (A), 440 volt, alternating current (VAC) power supply. The substation 106 transforms the input power to one or more 50 A, 120 VAC power supply lines, one of which is provided to the power distribution box (“power box”) 110 a. In some instances, the substation 106 is considered part of the utility grid power source 102 a. The mobile generator 102 b is also operable to output a 50 A, 120 VAC output to the power box 110 a. The power box 110 a receives the output of the power source 102 at an input receptacle, which is electrically coupled to an output receptacle of a power box 110 a. A daisy chain cable 112 is coupled to the output receptacle of the power box 110 a and to an input receptacle of a power box 110 b. A power box 110 c is similarly coupled by a daisy chain cable 112 to the power box 110 b. Thus, the output of the power source 102 is shared among each of the power boxes 110. In some instances, the substation 106 and/or mobile generator 102 b output multiple 50 A, 120 VAC outputs, each connected to a separate power box 110 or string of power boxes 110.

The power distribution boxes 110 distribute the received power to various outlets on each respective power distribution box 110. For example, each of the power distribution boxes illustrated in FIG. 1 include four 120 VAC outlets and two 5 volt, direct current (VDC) USB® type outlets, each powered by the power received at the input receptacle from the power source 102. At a worksite, various tools and other electronic devices may be coupled to the outlets of the power distribution boxes 110. For instance, the power distribution boxes 110 are coupled to one or more of an electric drill/driver 114 (120 VAC), a worksite radio 116 (120 VAC), a smart phone 118 (5 VDC); and a circular saw 120 (120 VAC).

The particular voltage levels of power lines described in this application are exemplary and approximate. For instance, the substation 106 may provide a single 240 VAC supply line to the power boxes 110, or two 120 VAC supplies lines that are combined to form a 240 VAC supply line. In such instances, the power boxes 110 may also include one or more 240 VAC outlets in addition to the 120 VAC outlets and 5 VDC USB® outlets. Additionally, the particular values are approximate and may vary in practice. For instance, the 120 VAC line may be nearer to about 110 VAC, and the 240 VAC supply line may be nearer to about 220 VAC. Furthermore, the power boxes 110 are illustrated and described herein as having common U.S.-style outlets and voltage levels. However, the power boxes 110 may be adapted for use with other outlet types and voltage levels, such as those common in Japan, Great Britain, Russia, Germany, etc.

The power boxes 110 further include a housing 127 with a base 128 to elevate the power boxes 110 above the ground, e.g., by 2 to 18 inches. The housing 127 may have a ruggedized construction including plastic and/or metal to withstand impacts, dropping, harsh weather, moisture, and other common wear and tear that occurs on a worksite. The base 128 includes legs 129. The base 128, housing 127, and legs 129 may be integral components or components that are secured to one another, e.g., via fasteners, welding, adhesive, etc. The elevation provided by the base 128 maintains the power boxes 110 out of water, dirt, contaminants, and hazardous materials that may be found on the ground of a worksite and that may pose issues to the power boxes 110 and safety risks.

FIG. 2 illustrates the power box 110 in greater detail. As described above, the power box 110 includes an input receptacle 130 for receiving a 50 A, 120 VAC power supply line 131 from the power source 102. The input receptacle 130 is electrically coupled to the output receptacle 132 via power lines 134, which may then be coupled to another power box 110 via a daisy-chain cable 112. The power lines 134 include a hot, neutral, and ground line, which are coupled to a main circuit breaker 136. The main breaker 136 is a “slow-blow” breaker that selectively opens when the current level drawn downstream of the main breaker 136 exceeds a predetermined threshold, such as 20 A or 25 A, for a certain amount of time, such as 100 milliseconds (ms). When opened, the main breaker 136 severs the electrical connections between the power lines 134 and the sub-breakers 138. The main breaker 136 may be manually reset by a user to re-connect the power lines 134 to the downstream components, such as by flipping a toggle switch.

An output side of the main breaker 136 is coupled to several sub-breakers 138. The sub-breakers 138 are similar to the main breaker 136 in function and may have the same predetermined threshold as the main breaker 136, or a predetermined threshold that is lower than the main breaker 136, such as 15 A or 20 A. Each of the sub-breakers 138A-D is coupled to a respective outlet circuit 140A-D, each of which includes one or more 120 VAC output receptacles 142. Each output receptacle 142 may be a ground fault circuit interrupter (GFCI) circuit for further safety, and may include a test and reset button (not shown). Sub-breaker 138E is coupled to a rectifier 144 for converting the 120 VAC to 5 VDC for providing to two USB® outlets 146

The power box 110 further includes a priority disconnect control module (“PD module”) 150. The PD module 150 is coupled to a current sensor 152 that monitors the current drawn by the sum of the components of the power box 110 downstream from the main breaker 136, including the current drawn via each of the outlet circuits 140A-D and USB® outlets 146. Although not shown, the PD module 150 and other non-illustrated circuits of the power box 110 are also powered by the power lines 134 via the main breaker 136.

The PD module 150 is further coupled to current sensors W, X, Y, and Z and to disconnect switches A, B, C, and D. The PD module 150 is operable to monitor the current drawn on the circuits of each of the breakers 138A-D. For instance, the current sensor W indicates the current drawn by the two receptacles 142 of the outlet circuit 140A. In some instances, a further current sensor and disconnect switch are provided for the USB® circuit of the breaker 138E.

The PD module 150 is also operable to control disconnect switches A, B, C, and D to selectively open and close. When a disconnect switch (e.g., switch A) is opened, the associated outlet circuit 140 becomes an open circuit that no longer conducts electricity to power a device plugged into one of the receptacles 142 of the outlet circuit 140.

The PD module 150 selectively opens and closes the disconnect switches A, B, C, and D dependent on one or more factors including predetermined current thresholds, outputs of the current sensors W, X, Y, and Z, and a disconnect scheme. For instance, the PD module 150 offers individual circuit protection for each of the outlet circuits 140A-D based on an individual circuit current threshold, which is generally set to trigger before the associated breaker 138A-D. For example, assuming the breaker 138A opens when current exceeds 15 A for 100 ms, the PD module 150 may selectively open the outlet circuit 140A when it exceeds an individual circuit current threshold of 14.5 A for 75 ms or 15 A for 50 ms.

The PD module 150 may leave the switch A open until a user reset or for a predetermined amount of time (e.g., five seconds). For instance, FIG. 3A illustrates a portion of the power box 110 of FIG. 2 wherein the PD module 150 includes a reset button 154 that indicates to the PD module 150 to close the switch A. Alternatively, a reset button 154 may manually close an associated disconnect switch.

In a first disconnect scheme, each outlet circuit 140A-D has a predetermined priority, which the PD module 150 uses to determine whether to open the associated disconnect switches A-D. For example, outlet circuit 140A has the highest priority (priority 1), outlet circuit 140 B has priority 2, outlet circuit 140C has priority 3, and outlet circuit 140D has the lowest priority (priority 4). The PD module 150 monitors the sum current drawn by the sum of the outlet circuits 140 using either the sum of the outputs of the current sensors W, X, Y, and Z, or by using the current sensor 152. The PD module 150 also has a predetermined priority disconnect threshold that is set to trigger before the main breaker 136 opens. For instance, FIG. 4A illustrates a graph of sum current over time, a main breaker threshold 158 of the main breaker 136, and the priority disconnect threshold 160. The main breaker threshold 158 is set at 20 A, while the priority disconnect threshold is set at 19 A.

As shown in FIG. 4A, when the sum current first exceeds the priority disconnect threshold 160, the PD module 150 determines the disconnect switch has the lowest priority and opens the switch (e.g., disconnect switch D). In response, the sum current then drops below the priority disconnect threshold 160. Later, the sum current exceeds the priority disconnect threshold 160 again. The PD module 150 determines the disconnect switch of the remaining closed switches that has the lowest priority (i.e., disconnect switch C). As the sum current remains above the priority disconnect threshold after opening disconnect switch C, the PD module 150 determines and opens the disconnect switch having the lowest priority (i.e., disconnect switch B). The sum current then drops below the priority disconnect threshold, with only disconnect switch A remaining closed.

The PD module 150 automatically disconnects outlet circuits 140 based on priority to keep the main breaker 136 from opening. Accordingly, a high priority tool or device (e.g., worksite lighting) coupled to a high priority outlet circuit 140, such as the outlet circuit 140A, remains powered. In contrast, the main breaker of a power box without the priority disconnect scheme would likely have opened, severing power to all devices connected to the power box 110 (see FIG. 4B).

The priority levels may be set using various techniques. For instance, the priority levels may be pre-set, e.g., at the time of manufacture, or may be configurable by a user via a priority selector 156 associated with each outlet circuit 140 such as shown in FIG. 3B. The priority selector 156 provides an indication of the user's priority selection to the PD module 150. The priority selector 156 may fewer or greater priority levels. For instance, the priority selector 156 may have merely a low and high priority selection, or the same number of priority levels as outlet circuits 140.

Additionally, in some instances, two outlet circuits 140 (e.g., 140A and 140B) may have the same priority (e.g., priority 1). If two outlet circuits 140 have the same priority, the PD module 150 may open both associated disconnect switches when the PD module 150 determines that (1) the priority disconnect threshold is exceeded and (2) the priority level of the two outlet circuits 140 are the lowest priority of the remaining outlets 140 having closed disconnect switches. In some instances, if two outlet circuits 140 have the same priority and the priority disconnect threshold is exceeded, the PD module 150 may determine which of the outlet circuits 140 has a larger current draw and open the disconnect switch associated with that outlet circuit 140.

In another disconnect scheme, an always-on selector 162 is provided for one or more of the outlet circuits 140. As shown in FIGS. 3A-B, the always-on selector 162 provides a bypass conducting path that bypasses an associated disconnect switch. Accordingly, even though the PD module 150 may control a disconnect switch to open, current is not interrupted to the associated outlet circuit 140. In an always-on mode, the breakers 136, 138 still provide circuit protection in the event of an over-current situation for an associated outlet circuit 140.

In another embodiment, the always-on selector does not physically bypass the disconnect switch. Rather, the always-on selector provides an indication to the PD module 150 whether the user has selected a priority disconnect mode or an always-on mode. While in always-on mode, the PD module 150 does not control the associated disconnect switch to open. In an always-on mode, the breakers 136, 138 still provide circuit protection in the event of an over-current situation for an associated outlet circuit 140.

In some embodiments, the outlet circuits 140 are considered either in an always-on mode or a low priority mode. When the priority disconnect threshold is exceeded, the PD module 150 determines the current level of each of the low priority outlet circuits 140 and opens the disconnect switch associated with the highest current drawing outlet circuit 140.

FIG. 5 illustrates a method 200 of implementing a priority disconnect scheme on the power box 110. In step 202, the priorities of the outlet circuits 140 are set. As noted, the priority levels may be set using various techniques, such as at the time of manufacture or by the priority selector 156. In step 204, the mode of the outlet circuits 140 are set to be either in an always-on mode or a priority disconnect mode. The mode of the outlet circuits 140 may be set using various techniques, such as at the time of manufacture or by the mode selector 162. In some instances, the outlet circuits 140 may have the mode setting feature or the priority setting feature, but not both. In such instances, the associated step 202 or 204 is bypassed.

In step 206, the power box 110 distributes power after being coupled to the power source 102 and after having one or more devices coupled to the receptacles 142. One or more of steps 202, 204, and 206 may be performed in a different order, simultaneously, and/or multiple times before reaching step 208.

In step 208, the PD module 150 detects various current levels of the power box 110. For instance, the PD module 150 monitors the outputs of the current sensors 152, W, X, Y, and Z. In step 210, the PD module 150 determines whether an individual circuit current threshold of one of the outlet circuits 140 has been exceeded based on outputs of the current sensors W, X, Y, and Z. If one or more individual circuit current thresholds have been exceeded, the PD module 150 opens the disconnect switches A, B, C, and/or D associated with the outlet circuit(s) 140A, B, C, and/or D having excessive current (step 212). If no individual circuit current thresholds have been exceeded, the PD module determines whether the sum current, e.g., as detected by current sensor 152, has exceeded the priority disconnect threshold (step 214). If not, the PD module 150 loops back to step 208 to again detect the current levels of the power box 110.

If the priority disconnect threshold has been exceeded, the PD module 150 determines in step 216 which of the disconnect switches A, B, C, and/or D to open based on the priorities and modes set in steps 202 and 204. For instance, in step 216, the PD module 150 determines which of the outlet circuits 140 has the lowest priority. Then, in step 218, the PD module 150 controls the disconnect switches A, B, C, and/or D associated with the determined, lowest priority outlet circuits to open. As described with respect to FIGS. 4A-B, the disconnect switch(es) are opened to reduce the current draw by the power box 110 to be below the priority disconnect threshold. If the opened disconnect switches succeed in reducing the sum current, the power box 110 will continue to distribute power on the outlet circuits 140 that remain active with closed disconnect switches. The sum current may remain above the priority disconnect threshold even with an opened disconnect switch if, for instance, the always-on mode selector 162 was active for that particular open circuit 140, or if the other outlet circuits 140 have high current levels. Accordingly, the PD module 150 cycles back to step 208 to proceed back through steps of the method 200 to determine whether to open further disconnect switches. In some instances, if a user alters priority or mode settings during steps 208-218, the method 200 returns to step 202 or 204, respectively.

In some embodiments, in step 216, the PD module 150 may also determine whether the outlet circuits 140 are in an always-on mode or a priority disconnect mode based on, for instance, on a signal provided by the selector 162. If one or more outlet circuit 140(s) are in an always-on mode, the PD module 150 excludes those outlet circuit 140(s) from being considered the lowest priority.

In some embodiments, the PD module 150 determines which of the lowest priority outlet circuits 140 is drawing the most current. Then, in step 218, the PD module 150 opens that high current outlet circuit 140.

Returning to FIG. 3A, the disconnect switches A, B, C, and D are each associated with indicator lights. The indicator lights may be, for example, light emitting diodes, that are selectively illuminated to indicate the status of the associated disconnect switch A, B, C, and D. For example, if the disconnect switch A is closed, the associated indicator light is activated to indicate to a user that the disconnect switch A is conducting and that the outlet circuit 140 a is active. In other embodiments, the indicator lights are selectively controlled, e.g., by the PD module 150, to illuminate when an associated disconnect switch A, B, C, or D has been opened.

FIG. 6 illustrates the power box 110 (110 _(a1) and 110 _(b1)) further including network communication capabilities. A power-line communication adapter (“adapter”) 300 is positioned between the power box 110 _(a1) and the power source 102. The adapter 300 is coupled to the power source 102 via incoming power line 302 and to the power box 110 _(a1) via outgoing power line 304. The adapter 300 is operable to communicate over the power line 304. In other words, the power line 304 carries both AC power (e.g., 120 VAC) and data communication signals. For example, the adapter 300 may follow the IEEE 1901 communication protocol for communicating data over the power line 304.

The adapter 300 is in communication with an external network 306, such as a local area network (LAN), wide area network (WAN), the Internet, or a combination thereof. The adapter 300 may be coupled to the network 306 wirelessly (e.g., via a WiFi® connection) or via a wired connection (e.g., via an Ethernet connection). The network 306 enables the adapter 300 to communicate with remote devices 308 (e.g., servers) coupled thereto. The adapter 300 includes a modem (not shown) to enable communication with the network 306. In some instances, the modem has a separate housing that is external to a housing containing other components of the adapter 300.

The adapter 300 is operable to provide a communication bridge between the network 306 and the power box 110 _(a1). The power box 110 _(a1), in turn, is operable to provide a communication bridge between external devices (e.g., smart phone 312) and the adapter 300. Accordingly, the smart phone 312 is operable to communicate with and access the network 306 via the adapter 300 and power box 110 _(a1) to access remote devices 308, the Internet, etc.

The power box 110 _(b1) is coupled to the power box 110 _(a1) via daisy chain cable 112. Three conductive paths (i.e., hot, neutral, and ground) are shared by the power box 110 _(b1), power box 110 _(a1), and adapter 300 via the cables 304 and 112. The power box 110 _(b1), power box 110 _(a1), and adapter 300 communicate over these shared power lines, for instance, by sending/receiving data packets using time-multiplexing. The power box 110 _(b1), like the power box 110 _(a1), is also operable to provide a communication bridge between external devices (e.g., laptops 314) and the adapter 300. Accordingly, the laptop 314 is operable to communicate with and access the network 306 via the adapter 300, the power box 110 _(a1), and the power box 110 _(b1).

FIG. 7 illustrates the power box 110 _(a1) having network communication capabilities in further detail. Within the power box 110 _(a1) are power circuitry and outlets 318 and a communications module 320. The power circuitry and outlets 318 include the various components downstream from the main breaker 136 illustrated in and described with respect to FIG. 2, such as the breakers 138, outlet circuits 140, USB® outlets 146, PD module 150, etc.

The communications module 320 includes a power line adapter 322, a router 324, antenna 326, and wired ports 328. The power line adapter 322 is similar to the power line adapter 300, except that the power line adapter 300 also provides the interface to the network 306. Thus, the adapter 322 is operable to communicate over the power line 304, and internal power lines 134, such that the power lines 304, 134 carry both AC power (e.g., 120 VAC) and data communication signals. For example, the adapters 300 and 322 may follow the IEEE 1901 communication protocol for communicating data over the power line 304.

The adapter 322 is coupled to a router 324. The router 324 is operable to form communication links with external devices 330, such as smart phones 312 and laptops 314, via the antenna 326 and wired ports 328. The router 324 directs data between the adapter 322 and the external devices 330. In some instances, only the antenna 326 or the wired ports 328 are provided on the power box, rather than both, for wireless-only or wired-only communications.

In some embodiments, alternative communication links are formed between the power box 110 and the network 306 and/or between multiple power boxes 110. For example, FIG. 8 illustrates the router 324 of the power box 110 _(a2) in communication with the network 306 via a network port 340, rather than via the adapter 300, power line 304, and adapter 322. The router 324 may further include a modem, or a modem may be external to the power box 110 _(a2) between the network port 340 and the network 306. The wired connection between the network port 340 and the network 306 may be an Ethernet® connection.

In some embodiments, in place of the wired connection between the router 324 and the network 306 as illustrated in FIG. 8, the network 306 may be in communication with the router 324 of the power box 110 _(a2) using a wireless connection via the antenna 326. For instance, the network 306 may be coupled to a modem/router base station (not shown) external to the power box 110 _(a2) and having an antenna for wireless communication with the router 324 via the antenna 326.

In some embodiments, the power box 110 includes a cellular data modem to couple the router 324 to the network 306 via a cellular data connection, such as a 3G, 4G, EDGE, or GSM connection, instead of or in addition to a power line data connection, wired connection (e.g., an Ethernet® connection), or local wireless connection (e.g., a WiFi® connection).

The components of the power box 110 used to couple the power box 110 to the network 306 either directly or through another power box 110, such as the adapter 322 and/or the router 324, may be referred to as a network connecting module. The components of the power box 110 used to communicate with external devices 330, such as the router 324 and antenna 326, may be referred to as a wireless network module.

Returning to FIG. 8, the power box 110 _(a2) is in wireless communication with the laptop 314 similar to the configuration illustrated in FIG. 7. Furthermore, the power box 111 a is in wireless communication with the power box 110 _(b2) using their respective antennas 326, rather than using the power-line adapter 300, 322 to communicate with the network 306. Additional power boxes 110 may be in wireless communication with the power boxes 110 _(a2) or 110 _(b2). Furthermore, the power boxes 110 _(a2) and 110 _(b2) may optionally include the power-line adapter 322 to communicate with other power boxes 110, such as those that are outside of wireless range of the power boxes 110 _(a2) and 110 _(b2).

Accordingly, the power boxes 110 are operable to form a wireless mesh network, a wired mesh network, or a combination thereof. With appropriate placement of power boxes 110 at a worksite, access to the Internet and/or other network 306 resources is available to worker devices (e.g., phones 312 and laptops 314) throughout the worksite.

Although not shown in detail, one or more of the output receptacles may include cables and receptacles with twist-to-lock/unlock mechanisms for securing cables to the power boxes 110. Additionally, the output receptacles may be recessed and include water-tight, hinged covers to prevent water ingress near the conductive elements. Alternative embodiments of the invention include different power, current, and voltage levels, different current thresholds, different numbers of output receptacles, and different types of output receptacles.

Thus, the invention provides, among other things, systems and methods for distributing temporary power including priority disconnect techniques and/or including communication networks. Embodiments of the invention relate to a power distribution box usable at a worksite to distribute temporary power. For instance, the power distribution box may include a power source input for receiving temporary power and also several standard outlets (e.g., 120 VAC, 60 Hz). The power distribution box may further include a power source output for connecting the power distribution box to another power distribution box. Thus, two or more power distribution boxes may be daisy chained together.

In one embodiment, a power distribution box is provided having a housing portion and a base portion elevating the housing portion above a surface on which the power distribution box is placed. The power distribution box further includes a power source input operable to receive power from an external power source; a plurality of alternating current (AC) output receptacles electrically coupled to the power source input; and a priority setting associated with each of the plurality of AC output receptacles. The power distribution box also includes a plurality of disconnect switches, each associated with a different one of the plurality of AC output receptacles; a sum current detector operable to detect the sum current conducted through the plurality of AC output receptacles; and a priority disconnect module coupled to the plurality disconnect switches and the sum current detector. The priority disconnect module is operable to determine that the sum current level exceeds a priority disconnect threshold; and in response to determining that the sum current level exceeds the priority disconnect threshold, control a first disconnect switch of the plurality of disconnect switches to selectively disconnect a first AC output receptacle of the plurality of AC output receptacles from the power input based on the priority level of the first AC output receptacle.

Various features and advantages of the invention are set forth in the following claims. 

What is claimed is:
 1. A power distribution box comprising: a housing portion; a base portion elevating the housing portion above a surface on which the power distribution box is placed; a power source input operable to receive power from an external power source; a plurality of alternating current (AC) output receptacles electrically coupled to the power source input; and a communication module including a network connecting module operable to connect to an external communication network, and a wireless network module operable to wirelessly communicate with an external device and to, thereby, connect the external device to the external communication network.
 2. The power distribution box of claim 1, further comprising a daisy-chain output electrically coupled to the power source input and operable to receive a daisy-chain cable that couples the power distribution box to a second power source input of a second power distribution box.
 3. The power distribution box of claim 2, further comprising a power-line communication module operable to connect to a second network connecting module of the second power distribution box over the daisy-chain cable.
 4. The power distribution box of claim 1, further comprising a power cable coupled to the power source input and providing the power from the external power source, wherein the network connecting module is operable to connect to the external communication network over the power cable.
 5. The power distribution box of claim 1, further comprising a power cable coupled to the power source input and providing the power from the external power source, wherein the network connecting module is operable to connect to the external communication network via a wired connection separate from the power cable.
 6. The power distribution box of claim 1, wherein the network connecting module is operable to connect to the external communication network wirelessly.
 7. The power distribution box of claim 1, wherein the wireless network module is further operable to wirelessly communicate with a second network connecting module of a second power distribution box to connect the second network connecting module to the external communication network.
 8. The power distribution box of claim 1, further comprising: a disconnect switch positioned between each AC output receptacle and the power source input; a priority level for each of the plurality of AC output receptacles; and a priority disconnect module operable to detect a sum current level for the plurality of AC output receptacles, determine that the sum current level exceeds a priority disconnect threshold, and selectively open at least one of the disconnect switches based on the priority levels in response to determining that the sum current level exceeds the priority disconnect threshold.
 9. The power distribution box of claim 1, further comprising: a current sensor; a priority level for each of the plurality of AC output receptacles; and a priority disconnect module operable to disconnect at least one of the plurality of AC output receptacles from the AC power source input based on the priority levels and an output of the current sensor.
 10. A communication bridge method for a power distribution box, the power distribution box including a communication module having a network connecting module and a wireless network module, the method comprising: positioning the power distribution box at a worksite, the power distribution box including a housing portion with a plurality of AC output receptacles and a base that elevates the housing portion; receiving, at a power input of the power distribution box, alternating current (AC) power from an external power source; distributing the AC power received from the external power source to the plurality of AC output receptacles; connecting the network connecting module of the power distribution box to an external communication network; and wirelessly communicating with an external device via the wireless network module of the power distribution box to thereby connect the external device to the external communication network.
 11. The communication bridge method of claim 10, further comprising: communicating, by the communication module, with a second power distribution box to thereby provide a bridge between the external communication network and the second power distribution box.
 12. A priority disconnect method for a power distribution box, the method comprising: receiving, at a power input of the power distribution box, alternating current (AC) power from an external power source; setting a priority level for each of a plurality of AC output receptacles of the power distribution box; distributing the AC power received from the external power source to the AC output receptacles; detecting a sum current level for the plurality of AC output receptacles; determining that the sum current level exceeds a priority disconnect threshold; and in response to determining that the sum current level exceeds the priority disconnect threshold, selectively disconnecting a first AC output receptacle of the plurality of AC output receptacles from the power input based on the priority level of the first AC output receptacle.
 13. The priority disconnect method of claim 12, further comprising: detecting individual current levels for each of the plurality of AC output receptacles; determining whether the individual current levels exceed an individual current threshold; and selectively disconnecting from the power input each of the plurality of AC output receptacles with individual current levels that exceed the individual current threshold.
 14. The priority disconnect method of claim 12, further comprising: opening a main breaker when current conducted via the main breaker exceeds a main breaker threshold, the main breaker positioned between the power input and the plurality of AC output receptacles and the main breaker threshold being higher than the priority disconnect threshold.
 15. The priority disconnect method of claim 14, opening a sub-breaker when current conducted via the sub-breaker exceeds a sub-breaker threshold, the sub-breaker positioned between the main breaker and a second AC output receptacle of the plurality of AC output receptacles, and the sub-breaker threshold being less than the main breaker threshold.
 16. The priority disconnect method of claim 12, wherein selectively disconnecting the first AC output receptacle from the power input based on the priority level of the first AC output receptacle further comprises: determining that the first AC output receptacle has the lowest priority of the plurality of AC output receptacles.
 17. The priority disconnect method of claim 12, wherein selectively disconnecting the first AC output receptacle from the power input based on the priority level of the first AC output receptacle further comprises: determining that the first AC output receptacle and a second AC output receptacle of the plurality of AC output receptacles have equal priority levels, wherein the first AC output receptacle is selectively disconnected based on the first AC output receptacle conducting more current than the second AC output receptacle.
 18. The priority disconnect method of claim 12, further comprising: selecting, individually for each of the plurality of AC output receptacles, one of an always-on mode and a priority disconnect mode.
 19. The priority disconnect method of claim 18, wherein selectively disconnecting the first AC output receptacle from the power input based on the priority level of the first AC output receptacle is further based on the first AC output receptacle having the lowest priority of a subset of the plurality of AC output receptacles in the priority disconnect mode.
 20. The priority disconnect method of claim 12, further comprising: connecting a communication module of the power distribution box to an external communication network; and connecting an external device to the external communication network via the communication module. 